Had one yesterday................Israeli lady quoted for cleaning of 3 carpets, 5 small rugs and 3 prs ctns insitu.
Arrived and started job, then asked to 'spruce up' 6 dining chairs, 10 lampshades, 2 footstools and 1 bedroom chair. All in little requests one or two at a time.
Cunning old girl had cheque for original quote already written out so i could not add any extra items to invoice. If job had not been £500+ then i would have sent her add on bill in the post.
I know for the next visit, added all items to original survey notes for future reference.

ps. Nick, Thanks for name drop in signature, i am flattered. . Should yours not read: Surreys No1 dart player and user.............sebo boy.